s1_goto_dir(){
	  cd "$1"
}
s2_touch_empty_file_with_given_name(){
	   touch "$1"
}
s3_make_directories(){
mkdir -p projects/git projects/backup
}
s4_create_6_files(){
	touch projects/linux1_centos projects/linux1_redhat
	projects/linux1_c_programming projects/linux2_centos
	projects/linux2_redhat projects/linux2_c_programming
}
s5_make_directories_in_git(){
	mkdir -p projects/git/linux1 projects/git/linux2
}
s6_move_files_to_dir_1_or_2(){
	mv projects/linux1_* projects/git/linux1/ && mv projects/linux2_*
	projects/git/linux2/
}
s7_create_package_and_compress(){
	tar -czvf projects/backup/git.tar.gz -C projects git
}
s8_delete_dir_git(){
	rm -rf projects/git
}
s9_recover_from_git_tar_gz_backup(){
	  tar -xzvf projects/backup/git.tar.gz -C projects
}
s10_create_package_and_compress(){
tar -jcvf projects/backup/git.tar.bz2 -C projects git
}
s11_find_and_sort_alphabetically_all_created_files_and_dirs(){
	find ./projects -type d -o -type f | sort
}
s12_get_next_15_minutes_boundary(){
	  now=$(date +%s)
	   future=$(( (now + 899 )/ 900 * 900  ))
	   date -d @"$future" +%Y-%m-%d_%H:%M:%S
}
